Journal of geochemical exploration vol:69 pages:47-51
The origin, geochemistry and migration patterns of palaeofluids during an orogeny have been investigated at the Variscan front zone in Belgium and northern France. A review has been made of four structural, mineralogical and geochemical studies of Variscan vein systems. The comparison of these case studies shows that open versus closed fluid how systems active during compressional deformation can be distinguished based on the data acquired. However, a detailed knowledge of the basin and of its diagenetic and tectonic evolution is necessary to determine the origin and migration pattern of the ancient fluids. This prerequisite partly restricts the predictability of the characteristics of the palaeofluids and the migration systems. (C) 2000 Elsevier Science B.V. All rights reserved.